dame myra

Science Dictionary
Hess   (hěs)  Pronunciation Key 
American geologist who studied the sea floor and developed the theory of sea-floor spreading in 1960. Hess theorized that sea floors were constantly renewed by the flow of magma from the Earth's mantle through the oceanic rifts. This hypothesis became an important component of the theory of plate tectonics.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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